Pantile

pantile \ˈpan-ˌtī(-ə)l\ noun: 1: a roofing tile whose cross section is an ogee curve, 2: a roofing tile of which the cross section is an arc of a circle and which is laid with alternate convex and concave surfaces uppermost

Etymology: pan + tile

I want to see a roof adorned with Pantone pantiles to mimic a color chart.